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Question

'X' is a phylum which has organisms with jointed appendages, and a segmented body.
'Y' is a phylum which has organisms with a notochord present at some stages of their life.
Identify 'X' and 'Y'.

A
X- Nematoda Y- Protochordata
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B
X- Molluscs Y- Protochordata
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C
X- Arthropoda Y- Nematoda
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D
X- Arthropoda Y- Protochordata
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Solution

The correct option is D X- Arthropoda Y- Protochordata

Arthropod means jointed legs. Animals which have jointed appendages belong to this phylum. This is the largest phylum in the animal kingdom. Features of Arthropoda are:

  1. They are bilaterally symmetrical.
  2. They have jointed appendages and a segmented body.
  3. They have a well-differentiated organ and organ system.
  4. They have an open circulatory system, but they do not have differentiated blood vessels.

Protochordates have the following features:

  1. They are bilaterally symmetrical and triploblastic.
  2. They have true coelom.
  3. They are found in marine habitats.
  4. Notochord is present at some stages of their lives.

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